As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4372, CREW REPORTED THEY RETURNED TO FIELD FOR LANDING GEAR AIR GROUND FAIL MESSAGE. GEAR WOULD NOT RETRACT. CMC MESSAGE LAND GEAR PROX SW FAIL. AIRCRAFT REMOVED FROM SERVICE. FOUND NOSE GEAR AIR/GROUND PROX SWITCH HAD FAILED REMOVED AND REPLACED PROX SWITCH RETRACTION CHECK GOOD IAW 145 AMM 32-30-00-700-801-A. AIRCRAFT RETURNED TO SERVICE.